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Se t. 24, 1929. A. P. CARLSON 1,729,244

SOUND POST Filed Aug. 20, 1925 Q9 /2 /2 U B /0 /n yen for H 5 4/ex. f? Ctr/50;?

Aim/we] vide an exceedingly simple and en means for supporting a violin bridge and propagating the vibrations to the rack t Patented Sept. 24, 1929 UNl'lED STATES PATENT OFFICE This invention relates generally to musical ALEX P. CARLSON, OF PORTLAND, OREGON SOUND POST Application filed August 20, 1925. Serial No. 51,441.

the base 20 is mounted the short sound post instruments and particularly to violins and 92 whi ch approximately under the E string ust behind the bridge 18 but actually sound posts therefor.

The first object of this invention is to pro nant qualities of an purpose of transmitting the vibrationsv The fifth object is to facilitate the adjustment of the sound post by providing a fiat area inside of the back of the instrument on which the post can'set Without detracting from the tone of the instrument.

These, and other objects, Will become more apparent from the specification following as illustrated in theaceompanying drawing, in

which Figure l is a plan of the body of a violin with the finger-board end broken away. Figure 2 is a longitudinal section taken along the line 22 in Figure 1. transverse section taken along the line 33 in Figure 1.

Xient herefriction.

nos-t. simple matter if an attempt is made to secure the marrimiun amount and quality of tones orations airtilled base for the having a large area.

I claim Figure 3 is 21 Similar numbers of reference refer to the same parts throughout the several views.

For the purpose of explaining the invention, there are illustrated the usual violin parts which include the back 10, the sides 11 and the top 12 in. which are formed the sound holes 13.

The button 14, tail piece 15, finger board 16, strings 17 and bridge 18 are also indicated.

On the underside of the top 12 and under the basestrings is the-usual ease bar 19.

is ordinarily placed.

On the flat top 21 of without the undesirable sounds.

at the point where the desired tone is obtamed without regard to its exact posltion. The post 22 18 not secured in any Way exlamiliar with the setting of sound snow that this operation is not a very Much of cnlty is due to the shape of the violin back which requires that the foot of the sound post be shaped accordingly. Should the slopes fail to coincide it is evident that a point contact will be the result instead one I am aware that sound posts have long been employed in the construction and use of violins. I therefore do not claim such devices broadly but I do intend to cover all such forms and modifications thereof as fall fairly within the appended claim.

ALEX P. CARLSON. 

